Alert archive / Florida / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Melbourne, FL

May 21, 2020Martin County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at May 21, 2020, 3:09 PM EDT for Martin County, Florida. It was in force for 30 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 21, 2020, 3:09 PM EDT (19:09 UTC)
Expired: May 21, 2020, 3:39 PM EDT
In force: 30 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Martin County, FL

The radar

The Melbourne radar (KMLB), 120 km from the middle of the area, began a volume at 19:09 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Miami, FL (KMFL), launched 12:00Z, 7.2 hours before the alert went out and 138 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2035 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 926 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

884 
WUUS52 KMLB 211909
SVRMLB
FLC085-212015-
/O.NEW.KMLB.SV.W.0021.200521T1909Z-200521T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Melbourne FL
309 PM EDT Thu May 21 2020

The National Weather Service in Melbourne has issued a

* Severe Thunderstorm Warning for...
  Martin County in east central Florida...

* Until 415 PM EDT.

* At 309 PM EDT, a severe thunderstorm was located 9 miles east of
  Indiantown, moving north at 10 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Stuart, Indiantown, Palm City, Port Salerno and Witham Field. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2696 8050 2721 8051 2721 8022 2696 8014
TIME...MOT...LOC 1909Z 159DEG 9KT 2703 8033 

HAIL...1.00IN
WIND...60MPH
 
$$

Smith

1 follow-up statement

356 
WWUS52 KMLB 211939
SVSMLB

Severe Weather Statement
National Weather Service Melbourne FL
339 PM EDT Thu May 21 2020

FLC085-211948-
/O.CAN.KMLB.SV.W.0021.000000T0000Z-200521T2015Z/
Martin FL-
339 PM EDT Thu May 21 2020

...THE SEVERE THUNDERSTORM WARNING FOR MARTIN COUNTY IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 2696 8050 2721 8051 2721 8022 2696 8014
TIME...MOT...LOC 1937Z 159DEG 9KT 2710 8036 

$$

Combs

The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 21, 3:17 AM EDT	Rip Current Statement	MLB	Volusia	41 hr
May 21, 2:43 PM EDT	Special Weather Statement	MLB	Martin	47 min
May 21, 3:31 PM EDT	Special Weather Statement	MLB	Indian River, Saint Lucie	59 min
May 21, 4:01 PM EDT	Severe Thunderstorm Warning	MLB	Saint Lucie	12 min
May 21, 4:21 PM EDT	Special Weather Statement	MLB	Okeechobee	54 min
May 21, 4:39 PM EDT	Special Weather Statement	MLB	Sumter	36 min
May 21, 4:45 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	18 min
May 21, 5:09 PM EDT	Severe Thunderstorm Warning	MLB	Okeechobee	19 min
May 21, 5:17 PM EDT	Special Weather Statement	MLB	Osceola	58 min
May 21, 5:27 PM EDT	Special Weather Statement	MLB	Lake	33 min
May 21, 5:34 PM EDT	Severe Thunderstorm Warning	MLB	Lake	26 min
May 21, 5:53 PM EDT	Special Weather Statement	MLB	Orange, Osceola	82 min
May 21, 6:12 PM EDT	Special Weather Statement	MLB	Indian River	33 min
May 21, 6:15 PM EDT	Severe Thunderstorm Warning	MLB	Orange, Osceola	41 min
May 21, 6:34 PM EDT	Special Weather Statement	MLB	Osceola	41 min
May 21, 6:37 PM EDT	Severe Thunderstorm Warning	MLB	Osceola	20 min
May 21, 6:52 PM EDT	Special Marine Warning	MLB		53 min
May 21, 7:14 PM EDT	Severe Thunderstorm Warning	MLB	Orange	21 min
May 21, 7:24 PM EDT	Special Weather Statement	MLB	Seminole	36 min
May 21, 7:26 PM EDT	Special Weather Statement	MLB	Brevard	34 min
May 21, 7:31 PM EDT	Severe Thunderstorm Warning	MLB	Seminole	29 min
May 21, 7:40 PM EDT	Special Weather Statement	MLB	Seminole	50 min

Nearby

Severe Thunderstorm Warnings in Florida, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.